Worked on enhancing the PostgreSQL dialect within the datametica/calcite repository by adding support for the TEXT, SERIAL, and DOUBLE PRECISION data types. This involved updating Java type mappings in PostgresqlSqlDialect.java and extending SqlTypeName.java to include new type definitions, ensuring broader compatibility with PostgreSQL schemas. Expanded test coverage was achieved by modifying CalciteRemoteDriverTest to validate the handling of these additional data types. The work focused on improving database interoperability and type support using Java, SQL, and PostgreSQL expertise. Delivered these changes as a single feature, reflecting a targeted and technically focused contribution during the month-long development period.